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https://github.com/lzap/fan3xxnsa

fan control daemon for NSA 310 NAS server
https://github.com/lzap/fan3xxnsa

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fan control daemon for NSA 310 NAS server

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README 

        
fan3xxnsa

=========



Fan control daemon for **NSA 310** NAS server.



It currently only support NSA 310 model only, patches for 32x and others are

needed (please send pull requests).



This is very simple and lightweight daemon that reads case temperature of Zyxel

NSA-310 and sets fan speed according to the temperature.



How does it work

----------------



The NSA 310 provides three temperatures. The first two are most likely case

temperatures, because according to all my measurements, they were always the

same (+- one degree) as the disc temperature reported by SMART. The third

temperature is from the CPU.



Please note the daemon only reads the case temperature (temp1), it ignores CPU

or HDD temperatures. Because it does not make any sense to measure it (and also

SMART spins up disc if used via command line tool - reading SMART values via

kernel is quite a work). Fan speed depends only on temp1, nothing else.



I use WD GreenPower in my NAS and the disc is 42 degrees Celsius when idle or

light work, so the threasold is 43 degrees. Also I have noticed this cheap and

small fan creates noise when rotating bellow 140 value, so the lowest is 160.

Make sure screws in the back side are loose, do not tighten them much as it

can put a pressure on the fan and create even more noise.



This is how it sets pwm according to temperature:



    Temp:<41 Pwm: 0

    Temp: 42 Pwm: 0

    Temp: 43 Pwm: 160

    Temp: 44 Pwm: 165

    Temp: 45 Pwm: 170

    Temp: 46 Pwm: 175

    Temp: 47 Pwm: 180

    Temp: 48 Pwm: 185

    Temp: 49 Pwm: 190

    Temp: 50 Pwm: 195

    Temp: 51 Pwm: 200

    Temp: 52 Pwm: 205

    Temp: 53 Pwm: 210

    Temp: 54 Pwm: 215

    Temp: 55 Pwm: 220

    Temp: 56 Pwm: 225

    Temp: 57 Pwm: 230

    Temp: 58 Pwm: 235

    Temp: 59 Pwm: 240

    Temp: 60 Pwm: 245

    Temp: 61 Pwm: 250

    Temp: 62 Pwm: 255

    Temp:>63 Pwm: 255



How to install

--------------



Very simple. First, you need Go language (golang). If you are on Debian

Wheezy, it is included. If you are going to build Go language from sources,

pick 1.0.2 version or higher in order to have ARM support.



To install fan3xxnsa on Debian, just do:



    apt-get install git golang

    git clone https://github.com/lzap/fan3xxnsa.git

    cd fan3xxnsa

    ./install.sh



The script compiles the program and installs it into `/usr/local/bin`

directory.



Before you start the daemon, **you need to enable fan control** with:



    echo 1 > /sys/class/i2c-dev/i2c-0/device/0-002e/pwm1_enable



Then you can start it on background using nohup for example:



    nohup /root/bin/fan3xxnsa 1>/dev/null 2>&1 &



Must be executed as root, or you can change permissions on the pwm1 file.



Put these two commands to any startup script of your distribution and you are

done.



Hacking

-------



The code is very easy to understand, feel free to send patches. If you want to

play with fans and temperatures, go to /sys/class/i2c-dev/i2c-0/device/0-002e

directory (it can be different according to your NSA model or kernel version -

try to find "pwm1_enable" file in the /sys/class directory).



Patches for other NSA models or kernel versions appreciated.



Discussion

----------



Discussion here: http://forum.nas-central.org/viewtopic.php?f=249&t=7405



You can use github issues to send bug reports, but please note I only have NSA

310 and I am not able to test with other models (feel free to send pull

requests tho).